Add support for arm and arm64 (#851)

* Add support for arm and arm64

* Drop arm from travis

* s/386/i386/

* Put the arch in the right place

* Prune the matrix

* Disable google auth tests on arm64

Something isn't right with how we re-exec ourselves to fake gcloud, so
disable that for arm.

* Disable logs for nested list test

This is causing travis to be really slow on my machine.

.goreleaser.yml

@@ -12,6 +12,11 @@ builds:
   - CGO_ENABLED=0
   main: ./cmd/crane/main.go
   binary: crane
+  goarch:
+    - amd64
+    - arm
+    - arm64
+    - 386
   goos:
     - linux
     - darwin
@@ -25,6 +30,11 @@ builds:
   - CGO_ENABLED=0
   main: ./cmd/gcrane/main.go
   binary: gcrane
+  goarch:
+    - amd64
+    - arm
+    - arm64
+    - 386
   goos:
     - linux
     - darwin

.travis.yml

@@ -13,11 +13,17 @@ env:
   - "GO111MODULE=off"
   - "GO111MODULE=on"
 
+arch:
+  - amd64
+  - arm64
+  - i386
+
 os:
   - windows
   - linux
 
-# Don't run all combos on Windows
+# Only run all combos for amd64.
+# Everything else is GO111MODULE=on + go 1.15
 jobs:
   exclude:
     - os: windows
@@ -26,6 +32,22 @@ jobs:
       go: "1.15"
       env: "GO111MODULE=off"
 
+    - os: linux
+      arch: arm64
+      go: "1.14"
+    - os: linux
+      arch: arm64
+      go: "1.15"
+      env: "GO111MODULE=off"
+
+    - os: linux
+      arch: i386
+      go: "1.14"
+    - os: linux
+      arch: i386
+      go: "1.15"
+      env: "GO111MODULE=off"
+
 
 git:
   depth: 1

pkg/v1/google/auth_test.go

@@ -1,3 +1,4 @@
+// +build !arm64
 // Copyright 2018 Google LLC All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");

pkg/v1/remote/multi_write_test.go

@@ -15,6 +15,8 @@
 package remote
 
 import (
+	"io/ioutil"
+	"log"
 	"net/http/httptest"
 	"net/url"
 	"testing"
@@ -116,8 +118,9 @@ func TestMultiWrite_Deep(t *testing.T) {
 		idx = mutate.AppendManifests(idx, mutate.IndexAddendum{Add: idx})
 	}
 
-	// Set up a fake registry.
-	s := httptest.NewServer(registry.New())
+	// Set up a fake registry (with NOP logger to avoid spamming test logs).
+	nopLog := log.New(ioutil.Discard, "", 0)
+	s := httptest.NewServer(registry.New(registry.Logger(nopLog)))
 	defer s.Close()
 	u, err := url.Parse(s.URL)
 	if err != nil {